The Newport has a GVWR of 18,000 lbs but it's not just about being able to pull 18,000 lbs. You need to look at payload too.
Although the empty pin weight spec is 3,210 lbs, you should plan on the loaded trailer being closer to 20% of GVWR, or 3,600 lbs. Add to that the weight of your hitch, bed liner, bed cover, tools, pets, passengers, firewood and anything else in the truck and your actual vertical load on the truck will probably approach 4,500 lbs. Check the actual payload spec on the specific truck you're considering to make sure it's at least that high. It should be printed on the label inside the drivers side door.
A new RAM 3500 Dually with appropriate configuration and options will easily do the job. But check the actual numbers on the truck you're look at.
You can get more info at
Fifth Wheel Safe Towing.